Why does vasodilation occur at the site of injury?

Vasodilation at the site of injury is a critical physiological response that facilitates the healing process. By widening the blood vessels, vasodilation increases blood flow to the affected area. This enhanced blood flow not only brings important nutrients and oxygen necessary for tissue repair but also allows for the movement of plasma and immune cells, particularly neutrophils, to reach the site of injury more effectively.

Neutrophils play a vital role in the inflammatory response, as they help to combat infection and clear debris from the injured tissue. The increased permeability of the blood vessels during vasodilation allows plasma proteins to escape into the surrounding tissue, contributing to the formation of edema, which is part of the body's defense mechanism and helps in the healing process.

Thus, the primary function of vasodilation is to enhance the transport of immune cells and essential substances needed for repair and recovery, making the selected answer appropriate in the context of injury management.